Web or film driving mechanism



June 18, 1940. l D W N 2,204,887

WEB 0R FILM DRIVING MECHANISM Filed March 4, 1959 INVENT OR. BY L EUN DEWHN ATTORNEY.

15 accomplish this action,

time, the fly wheel, whether operated by the film Patented June 18,

UNITED STATES PATENT OFFICE 2,204,887 WEB on m nalvmo. MECHANISM Leon Dewan, New York, N. Y., assignor of fifty t to George H.

Callaghan, New York,

Application March 4, 19:9, SerialNo. 259,929 comm. (c1. arr-2.3)

The present invention relates to improvements in web or film driving mechanisma Qne object of the invention is the provision of inertia means that will assist in imparting to a film during the recording or reproducing of sound, a steady constant motion, so that any flutter or wavering is absent.

Another object of the present invention is the provision of a, flywheel so mounted as to have I a steady and rapid-motion imparted thereto, and

which in turn acts as aninertia or momentum device to assist in moving the film steadily and constantly. e

Many ways and meanshave been devised to but up to the present advancingmeans or driven by and through the film, does not give the desired result. It is there-v fore proposed to so mount and drive 'a fly wheel I that it shall revolve at a much higher speed than the shaftwhich carries the film drum, and the fly wheel shaft and film drum shaft be-eoupled in such'manne'r that two smooth cylindrical surfaces, one or both of which may be magnetized if desired, are in constant rolling contact, the

' driven element being of a larger diameter, while the smaller-one is connected directly to and imparts rotation to the momentum device or fly wheel.

In the accompanying drawing: Figure 1 is a view in elevation of the invention as applied to a constant speed film driving sprocket.

Figure 2 is a side view thereof.

as Flgure3isaviewsimllartol lgurelofa modified form, and

Figure 4 is a side view thereof. Referring to the drawing, and more particularly to Figures 1 and 2, the numeral i-de'sig nates a fllm sprocket wheel, which may drive the film, not shown. or be driven, by such film;

Adjacent to one end of the wheel, is a smooth cylindrical 6, which may be integral or at-' tached' fixedly to the wheel land, this maybe of soft iron or magnetized metal.

Adjacent ,to the roller 6 and with its axis paral- ;lel to the axis of the wheel 5, is aflywheel 1,. which acts as a momentum device, and is driven 1 from the smooths-1m 6,'by means of the small smooth roller 8, the same being in such contact as to be rotated by the frictional engagement of.

the two, so that when the sprocket wheel 5 is rotated the fly wheel 'I will be rotated at a greatly increased speed, and thus act to iron out" any irregularities that the rotation of the sprocket wheel 6 might impart tothe fly wheel, In this manner the fly wheel due to its high speed gives the effect of a much larger inertia device rotated at the same speed as the flhn shaft. If the rim 6 is magnetic and the smooth roller 1 is of highly magnetized steel, then the magnetic pull creates friction between the two, so that a none-slip connection between the two elements is assured. It is preferred in this instance that 0 the smooth roller or rim be one pole, while the fly wheel per se is the other pole of the permanent magnet forming these members. In the arrangement shown in Figures 3 and 4, 9 designates the main plate of a sound motion 15 picture camera or projector, a driving sprocket ll being employed to move the sound film H, through the device, and over the smooth driven scanning drum l2, whose shaft I3 is journalled in the main plate and carries uponits opposite 20 end a drum or roller ll. Mounted upon a swinging arm ii, are set screws l6 carrying the large fly wheel I! and the small driven roller iii, the spring I9 being so tensioned as to hold the roller I I into frictional contact with the driven drum H, sothat the fly wheel is driven at a greater speed than the drum is, and acts asa means to iron out irregularities; in drum I 2. In this way, the sound film has imparted thereto a smooth constant speed, and permits the record- 30 ing and reproduction of sound of greatest fidelity. The roller and/or the roller l8 may be magnetized to create the necessary friction.

In Figure 3, the electric motor 23 drives a shaft 22, which in turn drives a small cylindrical smooth surfaced gear roller 2}, which is in frictional contact with the periphery of'the large roller or smooth gear 20 fast to the shaft HI. By this means a smooth continuous drive is pro- 40 vided for the film progressing mechanism.

Although thisinvention is shown in connection with a film drive it is evident that its eifect of imparting a smooth even motion is useful with and applicable to means for driving, any 45 carrier of sound wave recordationssuch as disc or cylinder records forexample.

through and at a greater speed than the rotative member.

2. In a web progressing mechanism, the combination of a rotative member over which the web is moved, a roller element operated thereby, a fly wheel, and a small roller operatively connected to the fly wheel and having direct rolling and frictional contact with the roller element, whereby the fly wheel is rotated at a greater speed than the rotative member.

3. A web progressing mechanism as claimed in claim 2, wherein the small roller and the roller element are additionally attracted to each other by magnetism.

4. A web progressing mechanism, including in combination a main support, a web drum mounted thereon, a momentum device in the form of a fly wheel mounted adjacent to the web drum, and cooperating smooth periphery gears carried re- 20 spectively by the web drum and the fly wheel,

the latter of which is of a smaller diameter than the former and directly engages the former.

5. A web progressing mechanism as claimed in claim 4, wherein the smooth periphery gears are additionally attracted to each other by permanent magnetism to create friction therebetween.

6. In a film progressing mechanism, means for driving a film, a scanning drum driven by the film, a flywheel and a small roller operatively connected thereto, said small roller being driven by the scanning drum through direct rolling and frictional contact with a rotative element concentric with the scanning drum whereby the flywheel rotates'at a greater speed than the scanning drum, the small roller and the rotative element having megnetism at this point of rolling contact to provide additional friction therebetween.

LEON DEWAN. 

